Greece will experience chilly conditions with negative temperatures on Monday, but a gradual warming is expected starting Tuesday. The weather will be generally clear, with cloud coverage in northern areas and increasing temperatures throughout the week. Rain is forecasted for Friday, particularly in western regions, while Attica and Thessaloniki are predicted to have sunny weather with temperatures ranging from 0 to 17 degrees Celsius. Winds will vary across regions, especially in the Aegean Sea.